First welcome,you can get all your dishes,pans,everything everyone thinks they need to camp and put it in a box,put it on your bathroom scale will give you a rough total,Don't forget bikes,grill ect.I would look at popups your needs ,wants will change ,go to your tag office they can answer your tag,tax questions long trips usually means more stuff,and don't forget friends the girls may want to bring along.
Long trips in a maxed out tow vehicle will make it very tired quickly learned that the hard way,I don't want to be a wet blanket just take your time don't let a salesman talk you into a camper he's knows you call pull.Good luck keep us posted on how's it going